While the 303 is a popular round all over the world, including Africa, Canada, and the U.S.A., Im going to guess the answer has to do with what it is used for and not used for by those who own it. That is, there are many bullets in .311dia very suitable for deer, elk and moose. So why would a solid be needed, especially when many 303 owners pocess other rifles for more specific tasks?
I own a sporterized SMLE and it has become my main deer rifle, but if I were to go on a more serious hunt I would take a different rifle. If I were to use it for smaller game than deer I would use cast bullets.
What did you have in mind?
Best,
Kurt
